<!--
 * @Author: your name
 * @Date: 2020-08-24 13:34:10
 * @LastEditTime: 2020-08-24 13:34:11
 * @LastEditors: your name
 * @Description: In User Settings Edit
 * @FilePath: \tinkjsDemo\滚动的边框.html
-->
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>边框虚线旋转</title>
    <style type="text/css" charset="utf-8">
        .coop-list {
            position: relative;
            width: 60%;
            overflow: hidden;
            margin: 20px;
        }
 
        .topBorder-move {
            position: relative;
            left: -1500px;
            width: 3000px;
            border-top: 2px dashed #DADDE1;
        }
 
        .bottomBorder-move {
            position: relative;
            left: -1500px;
            width: 4000px;
            border-bottom: 2px dashed #DADDE1;
        }
 
        .leftBorder-move {
            position: absolute;
            top: -1500px;
            width: 1px;
            height: 4000px;
            border-left: 2px dashed #DADDE1;
        }
 
        .rightBorder-move {
            position: absolute;
            right: 0;
            top: -1500px;
            width: 1px;
            height: 3000px;
            border-right: 2px dashed #DADDE1;
        }
    </style>
</head>
 
<body>
    <div class="coop-list">
        <div class="topBorder-move" id="J_borTop"></div>
        <div class="leftBorder-move" id="J_borLeft"></div>
        <div> 转啊转啊转啊转</div>
        <div class="rightBorder-move" id="J_borRight"></div>
        <div class="bottomBorder-move" id="J_borBottom"></div>
    </div>
 
    <script>
        var getStyleValue = function (ele, attr) {
            var doc = document;
            var style = ele.currentStyle || doc.defaultView.getComputedStyle(ele, null);
            return parseInt(style[attr].replace(/px/g, ""));
        };
 
        var $G = function (id) {
            return document.getElementById(id);
        };
 
        (function () {
            var borTop = $G("J_borTop"),
                 borBottom = $G("J_borBottom"),
                 borLeft = $G("J_borLeft"),
                 borRight = $G("J_borRight"),
                 left = getStyleValue(borTop, 'left'),
                 top = getStyleValue(borLeft, 'top');
 
            setInterval(function () {
                if (left < 0) {
                    left += 2;
                    borRight.style.top = left + "px";
                    borTop.style.left = left + "px";
                } else {
                    left = -1500
                };
 
                if (top > -3000) {
                    top -= 2;
                    borBottom.style.left = top + "px";
                    borLeft.style.top = top + "px";
                } else {
                    top = -1500
                };
            }, 60);
        })();
    </script>
</body>
</html>